Metering pump



Nov. 21, 1944. IHK, w, CROSSMAN 2,363,119

I METERING PUMP Filed Aug. 2e, 1943 2 sheets-sheep 2 FIC- Z WITNESSES.- ..1 y ...ly ITI INVENTOR.-

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` structed in accordance withv particularly adapted for employment with cordage lower block 8 Patented Nov. 2l, 1944 METEBING PUMP Kenneth W. Crossmara Willow Grove, Pa., as

signor to The .Pla

Edwin n. miler co.. Philadelphia. a corporation of Pennsylvania Application August zo, 1943, No. 500,158 4 claims. (ci. 10s-111) This invention relates to metering pumps for displacing and at .the same time metering iluids en route from a source of supply to a livery where the fluid is to be utilized.

Amongst the objects of my invention are to point of degenerally simplify the construction of pumps ofv the kind referred to with a view toward reducing the number of the parts, and so insure against easy derangement in service, and to obviate the `necessity for frequent attention in service.

A further aim of my invention is to secure the above advantages in a pump which is immune against leakage during idle or quiescent periods, and which can therefore be relied upon for accurate metering. i

Although applicable to other uses, pumps conmy invention are or rope-making machines where it is desirable to apply to the fibers which enter into the formation of such products, oil or other preservative solutions in definite uniform quantities, and where leakage during the idle or quiescent periods of the pumps would result in excessive soaking, of .the

fibers and consequent irregularities in the ap pearance and quality of such products.

One way in which the foregoing and other objects and important advantages can be realized in practice will appear from the following detailed description of the attached drawings. Y

Flg. 1 is a perspective view of a metering pump conveniently embodying my invention.

Fig. 2 shows the pump in horizontal section. Fig. 3 is a section taken as indicated by the angled arrows III--III in Fig. 2. Figs. 4-6 are fragmentary sectional views taken as indicated respectively by the angled arrows IV-IV, V-V and VI--VI in'Fig. 3.

Fig. 7 is a perspective view of the drive shaft of the pump with the incorporated flow control valve means; and

Fig. 8 is a `perspective view of the piston element of the pump.

As herein illustrated, my improved metering pump has a housing I which affords a pair of axially-aligned horizontally-arranged cylinders 2 and 2a in which operate the opposite ends of a piston element` 3 with a central recession or cutout at 4. Also as shown, the housing I provides a tubular bearing extension 5 at right-angles to the axis of the cylinders 2 and 2a for the journaling of a drive shaft 6. To the inner end of the drive shaft 6 is secured a rotary eccentric actuator I which revolves in an opening in a' folslidably engaged,l with capacity for 55 up and down movement, within the central cut or recess 4 `of the piston element 3. At 9 the drive shaft 8 is diametrically enlarged for the purposes of a control valve with crosswise notches or cuts at opposite, sides, the notches I and I I constituting a pair and being transversely aligned. while the individual notches I2 and I3 are spaced from `eachother and from said notches I0 and I I longitudinally of the shaft. From Fig. 2 it will benoted that the notches III and II are adapted to register with passages Il and I in thepump casing, said passages in turn communicating with crosswis'eD branches I9 and I'I formed in cover plates I9 and 20 that close the outer ends of the cylinders 2. The ports I2 and I3, onthe other hand, are adapted' to register respectively with e correspondingly spaced internal; annular grooves 2| and 22 formed in the bore of bearing 5 and communicating with inlet and outlet ports 23 and 24 which are threaded for connection of piping 2l and 28. As shown. longitudinal ducts 2l and 28 in the'enlarged portion 9 of the shaif. 6 respectively connect the recesses I0 and I2 with the recesses II and I3. A detachable cap piece 29 re- 25 movably secured to the end of the bearing 5 with ryimr a power application means 3|. For con' interposition of a packing gasket at serves to hold the shaft; l in place in the assembly, with its diametrically reduced end 8a protruding and car- 0 venience of attachment of the pump to the ma- 45. groove 2| and the recess chine or apparatus with which it is to be employed, the casing I is formed with a base 32 having apertures 33 for passageof anchoring bolts or the like: and for convenience of access `to the eccentric 1, the casing is further provided with a removable cover plate Il.

'Iheoperation of the pump is as follows: Let it be assumed that the shaft 8 is being rotated in the direction indicated by the arrow in Fig. 2 and that the piston elemen-t 3 ismoving in the direction shown by the arrow thereon in that lgure. As a consequence the fluid being pumped is drawn in through V.the inlet 25, and passes by way of the I2 in the enlargement 9 of the shaft 8, the ducts 21, port I0, and passages Iland I6 into the cylinder 2. At the same time oil previously taken into the other cylinder 2a is being displaced by way oi' the passages I1 and I 5,

recess II in the enlargement 9 of the shaft 6, duct 28, recess I3 and groove 22 for discharge by i way of the outlet port 24 into the pipe 2B. I

My improved pump is simple by virtue of having but two moving` parts, to wit, the one-piece piston element 3 and the shaft 6 with the incorported valve 9. 'I'he pump moreover is unique in that it can be easily and quickly disassembled in the event that replacements should become necessary after protracted periods of service, simply by removing one of the end covers I9 or 20, the top plate 3l and the cap piece 29. With this accomplished the shaft 6 can be drawn forwardly out of the bearing 5, the follower 8 withdrawn from above. and the piston element 3 withdrawn through the cylinder corresponding to the removed cover l9 or 20 as the case may be, and these parts as quickly reassembled or replaced by others if found to be defective for any reason. Immunity to leakage during idle or quiescent periods is insured through elimination of separate spring-biased ball or poppet suction and pressureresponsive valves such as are ordinarily used in pumps and which are liable to stick or to become otherwise easily deranged.

Having thus described my invention, Iclaim:

1. In a metering pump. a casing affording a pair of opposingly arranged cylinders, said casing having a valve bore, at right angles to the cylinders, fluid flow passages leading from the remote ends of the cylinders and terminating respectively in aligned relation at opposite sides of the bore, and fluid'inlet and outlet passages extending laterally from opposite sides of the bore in spaced relation to each other and to the terminals of the flow passages; a piston element common to the two cylinders, means for actuating the piston element; and a valve member inthe bore rotated in synchronism with the reciprocations of the piston, said valve member having a pair of transversely-aligned lateral recesses, adapted to alternately register respectively with the terminals of the flow passages, in the casing, individual lateral recesses in its opposite sides to intermitders, uid flow passages leading from the remote ends of the cylinders and terminating respectively in aligned relation at opposite sides of the bore in the bearing, and, fluid inlet and outlet ports extending laterally from opposite sides of the borel in spaced relation to each other and to the terminals of the flow passages; and a drive shaft journaled in the bearing and having actuating means at its inner end for operating the piston, a valve portion with a pair .of transversely-aligned lateral recesses which during rotation of the shaft alternately register respectively withthe terminals of theowpassages in the casing, individual lateral recesses in its opposite sides to intermittently register respectively with the inlet and outlet ports aforesaid, and ducts longitudinally of the shaft respectively between the two laterallyaligned recesses and the spaced individual recesses of said valve portion.

3. A metering pump according to claim 2, wherein the casing has removable covers which close the remote ends of the two cylinders, and which respectively provide portions of the two fluid flow passages within the casing.

4. A metering pump according to claim 2, wherein the outer end of the bearing is closed by a shaft retaining cap; and wherein the shaft has a diametrically reducedl end portion protruding through the cap for power application;

KENNETH W. CROSSMAN. 

